Come along for metal-drawing machines



Oct. 29, 1929. G. EBARNHART COME-ALONG FOR METAL DRAWING MACHINES FiledSept. l2, 1927 una @www ,Sv @WW W? kd.

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GEORGE E. BARNHART, 0F PASADENA, CALIFORNIA COME ALONG FOR METAL-DRAWINGMACHINES Application led September 12, 1927. Serial No. 219,162.

This invention relates to the art of forming ward end of which is forkedor slotted as metal objects, suchy as tubular or rod-like indicated at12 to receive a follower 13, such products by the operation of drawingthe follower consisting of a plate or bar slotted same through suitabledies or forming deas indicated at 14 to receive bolts 15, which 5,;vices, being more particularly a novel come extend through the forkedend of the carriage 55 along or gripping head arranged to impart 11,such mounting of the follower on the a positive movement of the Workthrough carriage 11 allowing a certain limited longithe dies or formingdevices. tudinal movement of the follower in the carlt .is one ofthe-principal objects olf my riage. The follower is provided withadowni@invention to produce a come-along of simple Wardly extending linger orabutment 16, 69 form and construction, edective to rmly which isdesigned to engage between the links grip thin walled material and soarranged ot a chain 17, the finger 16 engaging the pins as to, by simpleoperation of the return moveor rivets 18 of the chain. rlhis chain 17may ment of the come-along,quiclrly release such be of any desired form,preferably of the ie material. endless chain type, adapted to be drivenby e5 Another object of my invention is to pron sprockets from a powersource, as will be vide a come-along having gripping or wedge understoodby those skilled in the art. The blocks interiorly surfaced to enter thesur rear end of the carriage 11 is slotted horizontace oit the materialor stoclr to a predetertally, .as indicated at 20, to receive a camplate no mined distance and thereby prevent slippage 21, such cam platebeing' pivotally attached .'fo

ot the stock during the working operation. to the carriage by means of aheaded bolt or Another object ot my invention is to propin 22, retainedin place by means of a Cotter vide a come-along ot simple torni,arranged pin 23..

to grip material or stock in the torni ota a 'llhe cam plate 21 isprovided with two at tube without pointing the tube as ordinarilydiagonally disposed cain slots 24, such slots I5 dem, being diagonallydisposed with relation to @ther objects and advantages appear herethelongitudinal. axis oi the come-along, and

inatter from the following description and rearwardly converging asillustrated in accompanying drawings. Fig. 2. ao Referring to thedrawings, which are tor 25 designates two sets of bell cranl levers, so

illustrative purposes only, there being one such lever of each setdislig. 1 is a sectional elevation oil a comeposed above and the otherlever being disalong einbodyinga torni oil invention. posed below thecam plate 21, as shown in llig. 2 is a plan view, artly in section, otl. Each lever 25 comprises a long arm the corne-along shown in lig. l..2li and a short arm 27', the long arm ot each e5 le ig. d is across-sectional on line 3--3 set of levers being pivotally connected toa oi lig. headed pin. or pivotal member 28, which en d is across-sectional view online tends throngh slots 2li the cam plate 21'.ofig 2. The levers 25 are pivotally mounted by means abn nig. 5i anenlar ed longitudinal sectional ot pins or pivot ineinlfiers 30 in arecess 3l Q0 :ai drawings, il designates a the away troni the viertthrough one oi the wedge bloclrs, rfiiovvu 'formed in the rear end oi abead the engagement ol the saine with the spaced apart by spacingcollars 33. The short Stoch. arm 27 of eamch lever terminates in arounded Fig. 6 is a plan view partly in section ol a head 84, adapted toengage the forward ends modilied torni of my invention, and of stock ormaterial gripping wedges 35. Eig. 'E' is a cross sectional view on line'll-fl rllhese stoclr gripping we 1ges are mounted in out d. andengageable with a circular seat 3G, formed listening-particularly to theembodiment in a central opening in. *he head 32, the inner et myinvention shown in the accompanying surface or 'tace ol suol ieni ir lThe head 32 is supported in the machine by means of angle bars 41, andis directed through its travel by means of guide blocks or members 40,which slide between longitudinal channels ork members 42 of such frame.The short arms 27 of the levers 25 are beveled, as indicated at 44 inFig. 3, so as to permit Clearance for the stock, should the same extendforwardly between such levers. The stock gripping members 35 consist, inthe form shown, of four sections which together form substantially afrusto conical gripping member, each having its outer face taperedinwardly and rearwardly, as shown at 45, to engagek the seat 36 in thehead 32,` as shown in- Figs. 1 and 2:

Thesegripping members 35 are provided on their inner face with a seriesof ribs 48 designed to bite into the stock for the purpose of moresecurely gripping the same between the gripping members. These members45 are also provided with'channels 49 arranged to receive spring members50, having a tendency to expand such gripping members.

The come-along, in the form just described, operates in the followingmanner. It being understood that the chain 17 hasbeen engaged by thefinger 16 on the follower 13,l the follower resting upon the chain asshown` in Fig. 1, the follower is moved forwardly as indicatedby thearrow-in Fig. 1 until the rear bolt 15 engages the rear end of the slot14, whereupon the carriage is moved forwardly with the follwer and thepull of the carriage on the cam plate 21 causes the long arms 26 of thebell crank levers 25 to move inwardly in the position shown in Fig. 2.The further forward pulling movement -of the carriage exerts a furtherinward move- .ment of the arms 26, thereby causing pressure of the shortarms 27 .against the forward endy of the wedging members 35. Suchwedging members, due to their co-operative relation with the seat 36,are wedged tightly against the stock which, in the present i`stance,isshown as a tube 51, until the ribs bite into the stock. as shown in Fig.5, thereby firmly securing the stock in the come-along. When used fordrawing thin tubes, as indicated at 51, a short mandrel 52 is preferablyinserted in the end of the tube and the stock engaged between suchmandrel and the straight inner faces ofthe wedging members, as shown inFig. 5, after the ribs have engaged the stock as just described. Furtherforward movement of the carriage draws the entire comealong forwardly,together with the stock en-` gaged by the gripping members. After thestock has traveled through the dies, generally indicated-diagrammatically at 52, the movement of the gripping chain 17 isstopped and either reversed or the follower is disengaged from thechain. In either case the follower, being moved rearwardly, the arms 26are ipsasev opened, due to the engagement of the pins 28 in the camslots 24 in the plate 21. Such outward movement of the arms 26 relievespressure of the short arms against the stock engaging means, therebypermitting an opening or expanding of the members of the stock grippingmeans by disengagement of such members from the seat 36 in the head 32and removal of the work therefrom. By makin the seat 36 in the head 32short in length and the opening beveled away from such seat, asheretofore described, it will be understood that the wedging members maymore freely be moved from engagement with the stock than in the caseWhere a long engagement is had between such seat and the stock engagingmembers.

It is to be understood that the straight inner faces of the wedges 35between the ribs 48 are designed to engage the stock and at the sametime limit the depth of the biteof the ribs into the stock. By soconstructing the wedges va contact with the stock by the Wedges 35 ismaintained throughout the length of the wedges eXce t at the grooves 49.

As to the size of the ri s 48, such ribs are proportioned so that thearea of the ribs, multi'plied by the pressure exerted over the ribs, isless than the elastic limit of the stock.

l'n the form of come-along shown in Figs- 6 and 7, the head 60 receivesa plurality of wedgel members 61 which are engaged at their forward endsby levers 62 pivoted thereto, the outer ends of such levers beingconnected by links 63 with a carriage 64, which is provided with afinger 65 to engage the drive chain 66. The carriage 64 is recessed asshown at 67 to permit free movement of the come-along rearwardly, at theend of the drawing operation, the recess 67 allowing clearance for thestock indicated at 70.

I claim as my invention:

1. A come-along for advancing work through dies comprising: a headapertured to form a circular tapered seat; a plurality of stock gripplngmembers having ther outer faces engageable on said seat; a plurality oflevers pivotally mounted on said head engaglng said gripping members;and lever engaging means independent of said head for advancing saidhead and imparting grip ing movement to said stock grlpping mem ers,said levers comprising draft means for said gripping members.

2. A come-along for advancing Work through dies comprising: a headapertured to form a tapered seat; a plurality of stock gripping membershaving their outer faces engageable on said seat; a plurality of levers65 mental tapered gripping members in said members, said lever engagingmeans consisting of a cam plate and pins on said levers engaging saidcam plate.

3. LA come-along for advancing work through dies comprising: a headapertured vto form a tapered seat; a plurality of stock through dies: ahea gripping members having their outer faces engageable on said seat; aplunality of levers pivotally mounted on said head engaging saidgripping members and lever engaging means for advancing said head andimparting gripping movement to said stock gripping members, said lever.engaging means consisting of a plate having rearwardly converging camslots formed therein and means on said levers engaging in said camslots.

4. In combination with a driven member, a come-along for advancing workthrough dies comprising: a head apertured to form a seat; a plurality oftapered stock gripping members engaging said seat; a plurality of leverspivotally mounted on said head engaging said stock gripping members; aplate having cam slots therein; means on said levers engaging said camslots; supportingI means for said plate; and means for releas- -ablyconnecting said supporting means to said driven member.

5. In a come-along for advancing Work through dies: a head apertured toform a seat; a plurality of segmental frustro-conical gripping membersengaging said seat; and means pivotally mounted on said head andengaging said gripping members for simultaneously advancing said headand applying positive pressure to said gripping members in a directionopposed to said advance for forcingsaid gripping members against saidseat.

6. In a come-alon for advancing Work apertured to form a seat; aplurality of segmental frustro-conical gripping members engaging saidseat; means pivotally mounted on said head and engaging said grippingmembers for simultaneously advancing said head and applying positivepressure to said gripping members in a direction opposed to said advancefor forcing said gripping members against said seat; and means foryieldingly expanding said gripping members.

7. In combination with a driven member, a support, a head slidable onsaid support 'apertured to form a seat, wedge-shaped stock grippingmembers on said seat, bell 'crank levers plvotally mounted on said head,a short arm n said levers engaging said gripping member, a plate havingcam slots therein,- long arms on said levers, pins on said long armsengaging said cam slots, and means or'advancing said plate.

8. In a come-along for advancing material through dies, a head having anaperture therein forming a seat, a plurality of segh'ad engaging saidseat, and a plurality of ribs on the gripping face of said grippingmembers, said gripping members having corresponding recesses therein andspring members in said recesses to expand the gripping members.

9. A come-along comprising a head apertured to form a circular seat, aplurality of gripping members extending into said aperture in engagementwith said seat, and a plurality of draft members pivotally mounted onsaid head having gripping member engaging portions engaging the ends ofsaid gripping members.

10. A come-along comprising a head apertured to form a circular seat, aplurality of gripping members extending into said aperture in engagementWith said seat, and a plurality of draft members pivotally mounted onsaid head having gripping member ening portions engaging the ends ofsaid gripping members, said gripping members having recesses formedtherein and split ring elastic members in said recesses for yieldinglyexpanding the gripping members.

In testimony whereof, I have hereunto set my hand at Los Angeles,California, this 25th day of- August, 1927.

GEORGE E. BARNHART.

